From 1635, Piedmont had been forced to join France in its war against Spain, fighting principally against Spanish-controlled former Duchy of Milan, though its ruler, Victor Amadeus I, Duke of Savoy, avoided formally declaring war on Spain.
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In June 2005, Trenear-Harvey was conferred with a knighthood in the Order of Saints Maurice and Lazarus from HRH the Duke of Savoy.
His titles and estates were inherited by his brother-in-law Amadeus VIII, Count of Savoy, who later became Duke of Savoy and Antipope.
On 4 June 1627 he became the abbot of the monastery at Abondance and in 1637, on the death of his elder brother Victor Amadeus I, he and his brother Thomas claimed the regency of the duchy against Victor Amadeus's widow Christine Marie of France, but the king supported Christine and confirmed her as regent.
He brought about the disgrace of the tax farmer Alexandre Le Riche de La Poupelinière after he caught him in the company of his mistress, the actress Marie Antier.
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Since he had lost the Château de Condé to Jean-François Leriget de La Faye when it was confiscated from his family by Louis XIV) on March 6, 1719, he established himself in the hôtel de Soissons, which he transformed, with his wife who had followed him there, into a "sumptuous gaming house" which for a time sheltered the economist John Law.